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i965: Weaken the texture view rules for formats slightly

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Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
This commit is contained in:
Jason Ekstrand 2017-07-17 17:04:07 -07:00
parent fb86ac94cb
commit 6c2842f95b
1 changed files with 18 additions and 1 deletions
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19
src/mesa/drivers/dri/i965/intel_mipmap_tree.c
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@ -2507,6 +2507,23 @@ intel_miptree_texture_aux_usage(struct brw_context *brw,
return ISL_AUX_USAGE_NONE;
}
static bool
isl_formats_are_fast_clear_compatible(enum isl_format a, enum isl_format b)
{
/* On gen8 and earlier, the hardware was only capable of handling 0/1 clear
* values so sRGB curve application was a no-op for all fast-clearable
* formats.
*
* On gen9+, the hardware supports arbitrary clear values. For sRGB clear
* values, the hardware interprets the floats, not as what would be
* returned from the sampler (or written by the shader), but as being
* between format conversion and sRGB curve application. This means that
* we can switch between sRGB and UNORM without having to whack the clear
* color.
*/
return isl_format_srgb_to_linear(a) == isl_format_srgb_to_linear(b);
}
static void
intel_miptree_prepare_texture_slices(struct brw_context *brw,
struct intel_mipmap_tree *mt,
@ -2523,7 +2540,7 @@ intel_miptree_prepare_texture_slices(struct brw_context *brw,
* the sampler. If we have a texture view, we would have to perform the
* clear color conversion manually. Just disable clear color.
*/
if (mt->surf.format != view_format)
if (!isl_formats_are_fast_clear_compatible(mt->surf.format, view_format))
clear_supported = false;
intel_miptree_prepare_access(brw, mt, start_level, num_levels,